Dolphin Music Level 5 by Antoinette Moses (Cambridge English Readers)

Modern, original fiction for learners of English. It is 2051. CONTROL, the government of Europe, keeps everyone happy in a virtual reality where music made by dolphins gives exquisite pleasure. When Saul Grant, a writer, discovers the truth about the music, the illusion is shattered. He soon sets out to free the dolphins but CONTROL is aware of his actions and will stop him at any cost.